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Le psiconevrosi e le psicosi nei gemelli

Published online by Cambridge University Press:  01 August 2014

L. Braconi*
Affiliation:
Istituto di Genetica Medica dell'Università di Roma

Summary

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After having examined the literature on the subject, the A. presents the study he has carried on 60 twin-pairs with one or both twins suffering from neurosis or psychosis.

In 50 pairs a psychic suffering of neurotic type was present: out of the 20 MZ pairs, 18 were concordant with a percentage of 90%; out the 30 DZ pairs, 13 were concordant 43%.

Although discriminating the various forms and admitting the interference of environmental factors and other somato-psychic and psychogenetic causes, in 50% of the cases an undoubted psychotic and neurotic heredity was ascertained.

In the four pairs suffering from dysthymic psychosis the 3 MZ were concordant and the DZ discordant.

In the four pairs suffering from schizophrenia the MZ pair was concordant while the 3 DZ pairs were discordant.

In the two pairs of uncertain zygosity the concordance could not be extimated due to the death of the cotwin.

Dysthymia seems to be trasmitted as a dominant character and schizophrenia as a recessive.

Both dystymia and schizophrenia may undergo changes of expressivity with phenotypical characters which can be clinically mistaken as psychoneurotic forms.

Type
Research Article
Copyright
Copyright © The International Society for Twin Studies 1961

References

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